Brookfield DV3T Rheometer Manuel d'utilisateur télécharger pdf (Page 44)

Brookeld Engineering Labs., Inc. Page 44 Manual No. M13-2100

 FigureIII-19showsthePowerLawequationforatypicalsetofdata.Abrief

denitionoftheequationwillbeshownifthei(information)buttonispressed.

Figure III-19

 DetailedinformationaboutMathModelsispresentedinSectionVII.

III.12 Data Averaging

TheDV3TRheometerofferstwotechniquestoaveragedata,LiveAveragingandPostTestAveraging.

Dataaveragingcanbeusefulwhenmeasuringsampleswithentrainedairorsuspendedparticlesthat

casesomevariationinmeasurementresults.Dataaveragingmaynotbeusefulwhenchangesin

measurementresultsarecausedbytherheologicalpropertiesofthetestsamplesuchasthixotropyor

pseudoplasticity(shearthinning).Materialsthatexhibitthixotropywillshowasteadilydecreasing

measuredviscosityovertime.Materialsthatexhibitpseudoplasticitywillshowachangingviscosity

asthespindlespeedchanges.

TIP: When averaging datafor athixotropic material, begintheAveragingDuration afterthe

periodofmostsignicantchangeinmeasuredviscosity.Thiswillreducethevariabilityin

theaveragedvalue.

TIP: Whenaveragingdataforapseudoplasticmaterial,donotaveragetogether(TestAveraging)

datacollectedatdifferentspeeds(orshearrates).

Live Averaging of data occurs during actual testing of a sample. Data can be collected as an average

ofreadingsoveraspecictimeinterval;eachdatapointsavedintheleisanaveragedvalue.This

averagingisdenedintheDataCollectionsectionofCongureViscosityTest.

Single Point AveragingrequiresadenitionofAveragingDuration,theamountoftimefor

whichreadingswillbeaveraged.ThistimeparameterwillbeappliedattheendoftheEnd

Condition.Inthiscaseasingledatapointwillbecollectedwhichrepresentstheaverageofall

datameasuredduringthespeciedtimeperiod(AveragingDuration).

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Brookfield DV3T Rheometer Manuel d'utilisateur Page 44